Steam-boiler furnace.



PATENTBD JUNE 16, i903. I

G. F. GALLAGHER.

STEAM BOILER FURNAOE.

APPLIO'ATION FILED JUNE 12. 1901. BBNEWBD DBO. '4. 1902.

5 SHEETS-SHEET 1.

N0 MODEL.

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G50 ff No. 731,171. PATENTBD JUNE 16, 1903. G. F. GALLAGHER, STEAM BOILER PURNAGE.

APPLIGATION FILED JUNE 12. 1901. BHNEWBD mxo. 4. 1902. No MODEL. s SHEETS-SHEET 2.

No. 731,171. PATBNTBD JUNE 16, 1903.

STEAM BOILER FURNAGE.

APPLIUATIQN FILED JUNE 12. 1901'. RENBWBD DB0. 4. 1902. v

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UNITED STATES 'Patented .Tune 16, 1968.

PATENT OFFICE.

STEAM-BOLLER FURNACE.

SPECIFICATION' forming part of Letters Patent N o. 731,171, dated June 16,1903. Application filed il' une 12, 1901. RenewedDecemher 4, 1902. Serial No. 133,928. (No model.)

To a/ZZ whom it may'conccrn: y Be it known that I, GEORGE F. GALLAGEER,

a citizen of the United States, residing at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Steam-Boiler Furnaces; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to figures of reference marked t-hereon, which form a part of this specification.

My invention relates to improvements in steam-boiler furnaces for consuming smoke, and more particularly to that class in which passages are provided inthe walls of the furnace for conducting air from the outside to the front and rear of the fire-box and discharging it therein in a highly-heated state. Ihave found in practice that much depends in eecting a perfect combustion upon` the manner in which the superheated air is discharged into the fire-box, especially at the bridge-wall. Y

The principal object, therefore, of my present invention is to provide for an even distribution of the superheated air across the entire width of thebridge-wall in order that a perfect combustion of the smoke particles may be effected at all points in the rear of the fire-box.

To that end my invention consists, primarily, of a bridge-wall provided across its entire width with a seriesof uniform openings facing to the front and a series of airpassages in the walls of the furnace leading from the front and rear, each air-passage serving as a communication from the outside to a predetermined number of the openings in the bridge-Wall.

Myinvention further consists of other novel features in connection with the above outlined construction, all of which will be fully hereinafter described and claimed.

In the drawings, Figure 1 is a vertical transverse section of my improved furnace comprising a battery of boilers and taken in front of the bridge-wall. Fig. 2 is a horizontal section taken in the line o: of Fig. 1 looking in the direction of the arrow A. Fig. 3 is a horizontal section taken in the line y y of Fig. 1 looking in the direction of arrow B.-

Aaddition of a steam-spraying device.

Referring to the drawings, 1 1 are the side walls, 2 the rear wall, 3 the top wall or cover, and 4 the iron front, of a furnace containing a battery of three boilers.

5 is the bridge-wall, which, as clearly shown in Figs. 1 and 2, has a series of uniform openings, preferably shown as twelve in number and extending across the entire width of the bridge-wall. 6 and `7 are air-passages in the side walls, with openings through the front 4 of the furnace and extending back to and into the bridge-wall 5. The passage 6 communicates with the two end openings 8 8 in the bridgewall' and the passage 7 with the two other end openings 9 9 in the bridge-wall.

10 and V11 are air-passages in the side walls,

'with openings through the back wall 2 and extending forward to and into the bridgewall 5'. The passage 10 communicates with vthe two inner openings 12 12 in the bridgewall and lthe passage 11 with the two inner openings 13 13 in the bridge-wall.

` 14 and 15 (see Figs. 2 and 4) are air-passages in the side walls below the passages 10 and 11 and with openings through the back wall 2 and extending forward to and into the bridge-wal15. The passage 14 communicates with the two inner openings 16 16 in the bridge-wall and the passage 15 with the two inner openings 17 17 in the bridge-wall.

18 and 19 are two air-passages in the side walls, with openings through the back wall 2 and extending to and opening into the front part of the fire-box 20, and 21 and 22 are intermediate air-passages in the top wall 3 and between the boilers 23.

In operation the air which enters the various passages from'front and rear and is conducted therethrough to the rear of the firebox, through the bridge-wall 5, and also to the front of the lire-box is superheated before it reachesthe fire-box and, com mingling IOO with the products of combustion, effects a thorough and complete consumption of all the smoke particles. The su perheated air discharged through the bridge-wall is evenly distributed across its entire width by means of the separate air-passages, each communieating with an even and predetermined number of the openings in the bridge-wall. This has a uniform effect upon the burning fuel across the entire width of the grate-bars and insures a thorough consuming contact of the superheated air with every particle of the escaping products of combustion before they pass out over the bridge-wall. By means of this greatly-increased and practically perfect consumption of the fuel a very great saving is effected of the amount of coal required to feed the furnace. This applies equally well to both anthracite and bituminous coal, as with each variety the vprevention of smoke is equally accomplished, and the fuel required is necessarily reduced to a minimum.

In Figs. 5 and 6 l have shown a modified arrangement in a furnace with a single boiler in which the passages 24 and 25, opening at the front, communicate with the two outside series of openings 26 26 and 27 27 in the bridge-wall, and the passage 28, opening at the rear, commu uicates with the central opening 29 in the bridge-wall, and the two passages 30 and 31, opening at the rear, communicate with the front of the fire-box. A se ries of steam-discharge pipes 32, with flaring mouths 33, are so arranged as to provide one for each separate opening in the bridge-wall, as shown. The pipes 32 communicate with the common supply-pipe 34, provided with the valve 35, so that when desired a spreading jet of steam ma \7 be forced through each opening in the bridge-wall for blowing the soot and ashes from the openings in front of the bridge-wall. Theseaccumulationsareformed by banking the fire against the bridge-wall or firing so heavily that the fire is above the openings that cross the bridge-wall, and when the fire is burned down and recedes from the bridge-wall it leaves a deposit of ashes at the edge of the openings, and if thatis not removed it will soon become crusted and close the openings, which willpractically defeat the Another cause for closing the openings in the bridge-wall is that the reman will allow the ashes to accumulate on the grate-bars at the base of the bridgewall, which will eventually raise and cover the openings. The steam-jets are used to remove the ashes and soot, which will accumulate'under those circumstances from the fireboX only, as the registers are placed in a boiler-room outside of the boilers and never closed u p.

The flaring mouths of the steam-discharge pipes serve to throw the steam entirely across the entire width of each `op'ening, and thus thoroughly clean each opening of the accumulation of ashes and soot.

I claim- 1. In a steam-boiler furnace, abridge-wall provided across its entire width, with a series of uniform openings, facing to the front, and a series of air-passages in the walls of the furnace, leading from the front and rear, each air-passage serving as a communication from the outside to a predetermined number of the uniform openings in the bridge-wall, substantially as and for the purpose stated.

2. In a steam-boiler furnace, a bridge-wall provided across its entire width with a series of uniform openings, facing to the front, a series of air-passages in the walls of the furnace, Vleading from thevfront and rear, each air-passage serving as a communication from the outside to a predetermined number of the uniform openings in the bridge-wall, and a series of air-passages in the side and upper Walls of the furnace, leading from the rear wall of the furnace to the front of the fire-box.

3. In a steam-boiler furnace, a bridge-wall provided across its entire width with a series of uniform openings, facing to the front, a series of air-passages in the walls of the furnace, leading from the front and rear, each air-passage serving as a communication from the outside to a predetermined number of the uniform openings in the bridge-wall, and a series of steam-discharge pipes provided with mouths located, one in each of the separate uniform openings in the bridge-wall, substantially as and for the purpose stated.

4. In a steam-boiler furnace, a bridge-wall provided across its entire width with a. series of uniform openings, facing to the front, a series of air-passages in the walls of the furnace, leading from the front and rear, each air-passage serving as a communication from the outside to a predetermined number of the uniform openings in the bridge-Wall, a series of air-passages in the side and upper walls of the furnace, leading from the rear wall of the furnace to the front of the fire-box, and a series of steam-discharge pipes provided with mouths located, one in each of the separate uniform openings in the bridge-wall, substantially as and for the purpose stated.

In testimony whereof I have signed my naine to this specification in the presence of two subscribing Witnesses.

GEORGE F. GALLAGHER.

Witnesses:

C. S. JOHNSON, W. T. MILLER.

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